Technical Briefs

Effect of Surface Microstructure on Microchannel Heat Transfer Performance

[+] Author and Article Information
Yang Liu1

 Dalian University of Technology, Dalian 116024, Liaoning Province, Chinayang_liu@mail.dlut.edu.cn

Jing Cui, WeiZhong Li, Ning Zhang

 Dalian University of Technology, Dalian 116024, Liaoning Province, Chinayang_liu@mail.dlut.edu.cn


Corresponding author.

J. Heat Transfer 133(12), 124501 (Oct 12, 2011) (6 pages) doi:10.1115/1.4004594 History: Received July 27, 2010; Revised July 10, 2011; Published October 12, 2011; Online October 12, 2011

In this paper, forced convection heat transfer occurring in microchannels with different microstructures is investigated numerically. It is found that vortices will appear in the microstructure grooves. The influence of microchannel geometries on heat transfer performance is evaluated by Nusselt number and the entrance effect is noted for all geometries. Compared with the plain plate surface, a much more moderate decrease of local Nusselt number can be found for all the grooved microstructures, indicating more uniform heat transfer intensity along the flowing direction. The results also suggest that the heat transfer performance improves with inlet Reynolds number. The V-shaped grooved microstructure possesses the highest heat transfer performance. Compared with the plain plate surface, averaged Nusselt number can be increased by about 1.6 times. Through the field synergy principle analysis, we find that it is the synergy between temperature gradient and velocity that results in different heat transfer performance for different microstructures.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 9

Synergy angle β varying with Reynolds number

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Figure 1

Schematic of the flow passage

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Figure 2

Microstructure geometries and dimensions (Structure A: Ridge-shaped groove; Structure B: V-shaped groove; Structure C: shield-shaped groove; Structure D: straight slot groove; and Structure E: plain surface)

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Figure 3

Lattice geometries and velocity vectors of (a) D2Q9 model and (b) D2Q5 model

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Figure 4

Local Nu distribution along the flowing direction: (a) Structure A; (b) Structure B; (c) Structure C; (d) Structure D; and (e) Structure E

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Figure 5

Flowing direction averaged Nu

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Figure 6

Outlet temperature, K

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Figure 7

Streamlines for different microstructures under Re=  800 case

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Figure 8

Friction factor results



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